Incandescent-lamp socket.



N. MARSHALL.

INGANDESGENT LAMP SOCKET.

APPLIOATION FILED 001219. 1908.

Patented iuly 26, 1910.

UNITED STATES, PigrENir oFFIoiE.

" NORMAN MARSHALL; OF NEWTON, MASSACHUSETTS, ASSIGNQR, BY MESNE ASSIGN-vMENTQTO ARROW ELECTRIC COMPANY, OF HARTFORD, CONNECTICUT, A CORPORA-TION or CONNECTICUT.

T all whom it"ma g conccrn: 3e 1t known that. I N()RMAN li IARSiLiLL,

f 'wn of the United States,'residing at Newton, in the county-ofMiddlesexand State of Massachusetts, have invented certain new anduseful Improvements in Incandescent-Lamp Sockets; and'I do herebydeclare the following to be a full, clear, and exact description of theinvention, such as will enable others skilled in, the art to which itappertains to make and use the same The invention relates toincandescent lamp socketksuch as are adapted'to be se cured in positionupon fixtures. Fixture sockets have usually been pro vided with a screwthreaded nipple adapted to be screwed upon the threaded. end of an armor pipe on the fixture and'to engage a shoulder on the fixture arm. Thesocket.

nipple has also been provided witha set screw .adapted'to l)e"scre\vedagainst the nip- "ple of the fixture to assist in retaining the' socketin position. It is usually desirable. in securing sockets to fixtures;and particularly in the better grades of work, that the key of thesocket shall be located in a predetermined fixed position relation tothe fixture. 'With the fixture 1 sockets asusually constructed, whenthe. socket nipple is screwed tightlyagainst the Ifshoulder of thefixture arm, the key seldom comes in the desired position. It isnecessary, therefore,-

to either back off the socket until the key is" brought into the desiredposition, or to file away the end of the nipple by a cut'and try methoduntil the key comes in the desired position when the nipple is.screwedtightly against the shoulder on the fixture arm. In the first case thebacking olfof the socket renders it Mose; so thatit will not set squarewith the fixture, and the set screw forms an inefficient securingdevice- 139p retaining the socket in position on the fixture arm. Iii

cases where a husk or cover is used in connection with the socket, theset screws can seldombe reached, and the socket is either.

lcftloose upon the fixture, or the cut and try method: o.f bringing thekey into the de-' Specification of Letters Patent'. Application filedOctober 19, 1902;. $eria1 No. 458.463.

INCANDESCENT-LAMP SoCKET.

Patented July 26, 1910.

0 a sired position has to be resorted to. The

second or out and try method of positioning the socket is tedious andunsatisfactory, and the time' required for thus," securing, the socketupon the fixture frequehtly causes the cost of applying the socket toexceed many times the orlginal cost of the socket:

It has been proposed to provide tom the proper positioning of 'the keywith Irelation to the fixture by forming multiple fastenings upon thecap and shell of the socket, so

that when the nipple of the socket cap is firmly screwed .a a nsttheshoulder onthe fixture arm the s i'ell may be secured to the cap in anyone of a number of diifereiitpo sit-ions. This construction does notpermit, however, of the exact adjustment of the key with, relation tothe fixture, and it has been found that the socket caps are likely to bebroken in applying them to the fixture, since the wrench used for thispurpose is tonstructedto engage the thin outer wall of the socket cap.

It is accordingly one object of the present invention to provide afixture socket which may be readily and conveniently secured against theshoulder of a fixture, with the key located'iu any desired position inrelation to the fixture.

To-this end one feature of the invention consists in providing a keysocket with .means for securing the socket agaii st il shoulder on afixture with the key in any predetermined position in relation to thefixture.

In its broader aspects the invention contemplates the provision ofany-suitable.se

eur irigmeans which will enable the socket to be :firmly secured againstthe shoulder-of the fixture arm, and at the same time will enable thekey tobe located in any desired position when the socket is thussecured.-

In its preferred form the invention contemplatesthe provision of aswivel connec tion between the cap of the socket and'the means forsecuring the socket/t0 a fixture which will enable the position ot thecap with relatio'nl to thefixture to be yaried as desired in bringin thenipple of the cap firmly against the s .oulder on the nipplepf thesocket, or against the huskjjorucover nterposed between theshoulderiendythc mp ple of the socket. This featuresjif'the in-''..

husks or-covers, and under conditions which render the securing of theusual construction of socket caps to the fixtures inconvenient anddifiieult.

- The securing means which I preferto employ in embodying the inventionin a simple and eflicient construction which may be employed ineitherkey or keyless sockets consists of a swivel nut adapted to besecured locating t upon theend of the fixture arm and to firmly bind thesocket cap in position upon the fixture. -In its preferred construction,the nut is also provided with devices for .engaging [a wrench, theemployment of which facilitates the proper positioning of the socketcap, and the securing'of the cap upon the fixture arm.

The various features of the invention will be readily understood from aninspection 0; the accompanying drawings, in which Figure l is-aperspective view illustrating the manner of applying the cap of a socketembodying the lnventlon to the end of a fixture arm, and within asurrounding husk -or cover; Fig. 2 is an elevation showing a key socketembodying the invention secured in position upon the end of a fixturearm; Fig. 3 is an enlarged sectional view of a socket cap embodylngadifferent form of the invention; Figmt is an enlarged sectional Viewshowing the upper part of a socket cap embodying another; form of theinvention; and F gs. 5 and 6 are views of a wrench for convenientlyapplying the socket'c'a to the fixture arm and properly he key of thesocket. The socket shown in Fig. 2 comprises the shell 1 and cap 2 forinclosing the base.

which su ports the current carrying arts, the shell being providedwith'lthe usua slot through which the key? of the socket projectsradially. The ca and. shell may be provided with interloc ingeatches ofany suitable construction. In the construct on shown, the cap isprovided with 'two nwerdly extending projectionsarranged diaopposlte toeach other, one of which'is indicated at 4 in Fig. 1.":1

Infthe embodiment of the invention shown in Fig. 2, the cap of thesocket is provided with-a nut ,5 which is mounted toturn withinthe-nippleorhub 6 of theso'cket cap. In

,this'jeonstructionfthe nipple'rof the socket cap is-formedby carryingup the thin walls of the socket cap so that they surround the nut 5, andturning in the upper edge of the end of the nut, an adapted to e clampedbetween the end of the nut and the shoulder .or flange '8 on the end ofthe fixture arm, or .to be clamped between the end. of the nut and ahusk 9 in case a husk is interposed between the shoulder on the socketarm and the nipple of the socket cap. The nut is :provide with anannular groove, and the wall of the cap is bent to form an inwardlyprojecting rib 10 which engages the groove and retains the nut in the caThe inner or slots 11 for the reception of projections on a wrench to bedescribed.

In the construction shown in Fig. 3, the nipple 14 of the socket cap isin the form of a metal sleeve which is secured to the thin sheet metalof which the main bed of the shell is formed in substantially tie samemanner that the screw threaded nipple is secured to the body of the capin the usual construction of socket. The nipplefll t is provided with a.reduced portion'1,5 which fits within an opening in the body 16 .of thesocket cap. The wall of the socket cap about the opening is bent to forma recess within which an annular ring 17 fits. The inner surface of theringis provided with a pluralit'y of grooves, and the socket body isprovided with fingers which are bent downward into these grooves. Thelower end of the reduced portion 3.5 of the nipple is bent outward tofirmly bind the socket cap against the shoulder formed on the nipple,and to securely bind the projecting fingers of the socketgbody withinthe grooves in the ring 17 ,(ahdyto: bind the ring in position. In thiselit st-notion the swivel nut 18 is mounted *witlnn'the. nipple 14, andthe-upper end of the nipple is provided with a flange 19 extending inover the upper end of the nut; The nut is provided at its lower end withan outwardly projecting flange 20 whichunderlies the lower end of thenlp le 14. The inner end of the nut isprovi ed with slots or recesses 21for connecting it with the wrench to be described. The flange 20 may beconstructed to be engagedby the allowing it to turn-withrelationzthereto'.

In the construction shown' in-'Fig. 4 thenipple 23 is secured to themain bodyof the cap in the same manner as; deseribed with reference toFi' 3. In this construction the swivel nut 24 is provided at its upperend with an outwardly projecting flange 25 within a recess in the upperend: of the nut within the nipp In Figs. 5 and 6 a'wrenchfils shown,

end of the nut is provided wit 1 two recesses.

wall to form a flan e 7 overlyin the upper innerv edge of the cap lining22, so that the lining actsto hold the nut in the cap, while lyingnipple 23,-this flange a'ctlng to retain the the use of which thesocket. cap may be readily and accurately securedto a fixture. Thiswrench comprises a head 26 adapted to fit within the socket cap, andthis head is provided with two slots o-rfrecesses 27 within which therejections L of the socket capfit, so that-t e cap is accuratelypositioned upon the head. The head-1s pro-- vided with a radiallyprojecting arm .28 whieh'is so arranged with reference to thepositioning recesses 27 that its positipn with relation to the cap whenthe cap is on the head 25 corresponds to the position of the key of thesocket when the shell is connected with the cap. The nut turning part ofthe wrench consists of a shaft 29 vexte ding through thecenter of thehead 26, an provided on its front end with two projections upon the headof the wrench, the cap is applied to the fixture nipple, the arm 28 being held in the position where it is desired that the key of the socketbe located. The

' nut is then screwed on to the nip 1e of the .in place.

fixture by turning the shaft 29 of t e wrench until the cap or cap andhusk are firmly secured against the shoulder-on the fixture arm, the keylocating arm'28-being retained.

in position where it is desinedfthat the ,key of the socket be located.The, wrench-is then removed from. the socket cap. After the socket'hasbeen wired, and the socket shell is attached to the cap, the key of thesocket will come in the exact position where the locating arm 28 washeld during the attachment of the socket cap to thefixture.

With this construction, keysockets may be quickly and firmly secured'tofixture arms and the key located in any desired position with relationto the fixture. This construction also enables the caps of keylesssockets to be quickly and conveniently secured upon the ends of fixturearms within husks or covers, which would render the'securing of theordinary socket cap to the fixture arm inconvenient and difiicult. Inscrewingthc socket firmly on to the fixture the torsional strain comeson the nut and not upon the thin partof the cap, and there is no dangerof injury to the ea in screwing it firmly The slot. in the inner end ofthe nut enables the nut to'be operated by an ordinary-screw driver ifoccasion requires.

VVhi'le I prefer to employ a" construction and arrangement of parts suchas shown in the drawings, it will be understood that the broaderfeatures of the invention are not llmitcd to the specific constructionand arrangement of devices shown and described,

and that such construction may be varied and modified without departingfrom the invention.

Having explained the nature and object of the invention and specificallydescribed certain constructlons in which the invention may be embodied,what I claim is 1. Avkey socket PI'OVidQXl'hVitll means for clamping thesocket against a shoulder on a fixture with the key in any predeterminedposition with relation to the fixture, substantially as-described.

2. A key socket provided-with a swivel nut for clamping the socket to ashoulder on the fixture with the key in any predetermined .position withrelation to the fixture,

substantially as described.

3. A socket provided with a swivelnut for clamping the socket inposition against the shoulder on a fixture, substantially as described.

4. A socket, having, in eombination,a shell, a cap-provided-with anipple, an a. swivel nut for clamping the ni ple of the socket against ashoulder on a ixture, sub-' stantially as described.

5. A1socket, having, in combination, a key, a shell, a cap provided witha nipple, and a swivel nut for clamping the nipple against a shoulder ona fixture, substanti. 1y as described.

6.'A socket, having, in combination, a

socket cap, means for clamping the cap "against a shoulder on a fixture,and a swivel connection between the cap and clamping means,substantially as described.

' 7. 'A socket provided with a swivel nut for clamping the socketagainst a shoulder on a fixture, and wrench engaging devices on theinner end of the nut, substantially as described. r

8. The combination with a fixture having an externally threaded hub anda flange of acap having a hub adapted to engage the flange of thefixture and having an annular shoulder, and a nut adapted to clamp thehub of the cap between itself and the flange on the fixture and having ashoulder engaging the shoulder on the cap, and means for retaining thenut in stantially as describe 9. The combinationwith a fixture having anexternally threaded hub and a flange, of a cap having a hub ada ted' toengage the flan e of the fixture and aving an annular shou der and a nutadapted to clamp the hub of the cap between itself and the flange (placeinthe cap, subon the fixture and having a shoulder adapted to enga e theshoulder on the capsubstantially a s deScribed.

10. The combination with a fixture having an externally threaded hub anda flange, of a cap having a hub adapted to engage the fian 'e oft-hefixture, a nut adapted to clamp the hub of-the Gap between itself andthe flange on the fixture and provided with an annular groove, and aninwardly extending annular rib on the hub of the cap engaging saidgroove to retain the nutin place in the cap, substantially as described.10

' In-testimony whereof I afiix my signature, in presence of twowitnesses. v

NORMAN MARSHALL. Witnesses:

jM. L. GiLMAN,

MCPIIAI a

